Distance measuring device for a camera

Details Distance measuring device for a camera Distance measuring device for a camera

1997-09-19

1999-01-19

Parkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Having auxiliary illumination

356 307, G03B 1336, G01C 308

Patent

active

058624180

ABSTRACT:
A distance measurement apparatus comprises a light emitting device for emitting light to an object, a light receiving device including a plurality of photocells for receiving light emitted by the light emitting device and reflected by the object, an adding circuit for adding outputs of an arbitrary number of photocells from among the plurality of photocells, and a control circuit for controlling the light emitting device, the light receiving device and the adding circuit. The control circuit comprises a determining circuit for determining a first group of photocells having a maximum addition result based on the addition performed by the adding circuit, and a calculating circuit for setting a second group of photocells comprised of the first group of photocells and a single or a series of photocells contiguous to the first group of photocells, dividing the second group of photocells into element subgroups, and calculating a distance to an object based on outputs of respective divided element groups.

REFERENCES:
patent: 5245398 (1993-09-01), Ludden
patent: 5500728 (1996-03-01), Nishimoto

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